[linux.git] / fs / proc / task_nommu.c


#include <linux/mm.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/fs_struct.h>
#include <linux/mount.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include "internal.h"

/*
 * Logic: we've got two memory sums for each process, "shared", and
 * "non-shared". Shared memory may get counted more than once, for
 * each process that owns it. Non-shared memory is counted
 * accurately.
 */
void task_mem(struct seq_file *m, struct mm_struct *mm)
{
	struct vm_area_struct *vma;
	struct vm_region *region;
	struct rb_node *p;
	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
        
	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);

		bytes += kobjsize(vma);

		region = vma->vm_region;
		if (region) {
			size = kobjsize(region);
			size += region->vm_end - region->vm_start;
		} else {
			size = vma->vm_end - vma->vm_start;
		}

		if (atomic_read(&mm->mm_count) > 1 ||
		    vma->vm_flags & VM_MAYSHARE) {
			sbytes += size;
		} else {
			bytes += size;
			if (region)
				slack = region->vm_end - vma->vm_end;
		}
	}

	if (atomic_read(&mm->mm_count) > 1)
		sbytes += kobjsize(mm);
	else
		bytes += kobjsize(mm);
	
	if (current->fs && current->fs->users > 1)
		sbytes += kobjsize(current->fs);
	else
		bytes += kobjsize(current->fs);

	if (current->files && atomic_read(&current->files->count) > 1)
		sbytes += kobjsize(current->files);
	else
		bytes += kobjsize(current->files);

	if (current->sighand && atomic_read(&current->sighand->count) > 1)
		sbytes += kobjsize(current->sighand);
	else
		bytes += kobjsize(current->sighand);

	bytes += kobjsize(current); /* includes kernel stack */

	seq_printf(m,
		"Mem:\t%8lu bytes\n"
		"Slack:\t%8lu bytes\n"
		"Shared:\t%8lu bytes\n",
		bytes, slack, sbytes);

	up_read(&mm->mmap_sem);
}

unsigned long task_vsize(struct mm_struct *mm)
{
	struct vm_area_struct *vma;
	struct rb_node *p;
	unsigned long vsize = 0;

	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);
		vsize += vma->vm_end - vma->vm_start;
	}
	up_read(&mm->mmap_sem);
	return vsize;
}

unsigned long task_statm(struct mm_struct *mm,
			 unsigned long *shared, unsigned long *text,
			 unsigned long *data, unsigned long *resident)
{
	struct vm_area_struct *vma;
	struct vm_region *region;
	struct rb_node *p;
	unsigned long size = kobjsize(mm);

	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);
		size += kobjsize(vma);
		region = vma->vm_region;
		if (region) {
			size += kobjsize(region);
			size += region->vm_end - region->vm_start;
		}
	}

	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
		>> PAGE_SHIFT;
	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
		>> PAGE_SHIFT;
	up_read(&mm->mmap_sem);
	size >>= PAGE_SHIFT;
	size += *text + *data;
	*resident = size;
	return size;
}

/*
 * display a single VMA to a sequenced file
 */
static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
			  int is_pid)
{
	struct mm_struct *mm = vma->vm_mm;
	struct proc_maps_private *priv = m->private;
	unsigned long ino = 0;
	struct file *file;
	dev_t dev = 0;
	int flags;
	unsigned long long pgoff = 0;

	flags = vma->vm_flags;
	file = vma->vm_file;

	if (file) {
		struct inode *inode = file_inode(vma->vm_file);
		dev = inode->i_sb->s_dev;
		ino = inode->i_ino;
		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
	}

	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
	seq_printf(m,
		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
		   vma->vm_start,
		   vma->vm_end,
		   flags & VM_READ ? 'r' : '-',
		   flags & VM_WRITE ? 'w' : '-',
		   flags & VM_EXEC ? 'x' : '-',
		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
		   pgoff,
		   MAJOR(dev), MINOR(dev), ino);

	if (file) {
		seq_pad(m, ' ');
		seq_path(m, &file->f_path, "");
	} else if (mm) {
		pid_t tid = vm_is_stack(priv->task, vma, is_pid);

		if (tid != 0) {
			seq_pad(m, ' ');
			/*
			 * Thread stack in /proc/PID/task/TID/maps or
			 * the main process stack.
			 */
			if (!is_pid || (vma->vm_start <= mm->start_stack &&
			    vma->vm_end >= mm->start_stack))
				seq_printf(m, "[stack]");
			else
				seq_printf(m, "[stack:%d]", tid);
		}
	}

	seq_putc(m, '\n');
	return 0;
}

/*
 * display mapping lines for a particular process's /proc/pid/maps
 */
static int show_map(struct seq_file *m, void *_p, int is_pid)
{
	struct rb_node *p = _p;

	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
			      is_pid);
}

static int show_pid_map(struct seq_file *m, void *_p)
{
	return show_map(m, _p, 1);
}

static int show_tid_map(struct seq_file *m, void *_p)
{
	return show_map(m, _p, 0);
}

static void *m_start(struct seq_file *m, loff_t *pos)
{
	struct proc_maps_private *priv = m->private;
	struct mm_struct *mm;
	struct rb_node *p;
	loff_t n = *pos;

	/* pin the task and mm whilst we play with them */
	priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
	if (!priv->task)
		return ERR_PTR(-ESRCH);

	mm = priv->mm;
	if (!mm || !atomic_inc_not_zero(&mm->mm_users)) {
		put_task_struct(priv->task);
		priv->task = NULL;
		return NULL;
	}
	down_read(&mm->mmap_sem);

	/* start from the Nth VMA */
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
		if (n-- == 0)
			return p;
	return NULL;
}

static void m_stop(struct seq_file *m, void *_vml)
{
	struct proc_maps_private *priv = m->private;

	if (priv->task) {
		struct mm_struct *mm = priv->task->mm;
		up_read(&mm->mmap_sem);
		mmput(mm);
		put_task_struct(priv->task);
	}
}

static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
{
	struct rb_node *p = _p;

	(*pos)++;
	return p ? rb_next(p) : NULL;
}

static const struct seq_operations proc_pid_maps_ops = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_pid_map
};

static const struct seq_operations proc_tid_maps_ops = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_tid_map
};

static int maps_open(struct inode *inode, struct file *file,
		     const struct seq_operations *ops)
{
	struct proc_maps_private *priv;

	priv = __seq_open_private(file, ops, sizeof(*priv));
	if (!priv)
		return -ENOMEM;

	priv->pid = proc_pid(inode);
	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
	if (IS_ERR(priv->mm)) {
		int err = PTR_ERR(priv->mm);

		seq_release_private(inode, file);
		return err;
	}

	return 0;
}


static int map_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;
	struct proc_maps_private *priv = seq->private;

	if (priv->mm)
		mmdrop(priv->mm);

	return seq_release_private(inode, file);
}

static int pid_maps_open(struct inode *inode, struct file *file)
{
	return maps_open(inode, file, &proc_pid_maps_ops);
}

static int tid_maps_open(struct inode *inode, struct file *file)
{
	return maps_open(inode, file, &proc_tid_maps_ops);
}

const struct file_operations proc_pid_maps_operations = {
	.open		= pid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};

const struct file_operations proc_tid_maps_operations = {
	.open		= tid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};
Commit	Line	Data
1da177e4 LT	1
	2	#include <linux/mm.h>
	3	#include <linux/file.h>
eb28062f	4	#include <linux/fdtable.h>
5ad4e53b	5	#include <linux/fs_struct.h>
1da177e4	6	#include <linux/mount.h>
5096add8	7	#include <linux/ptrace.h>
5a0e3ad6	8	#include <linux/slab.h>
1da177e4 LT	9	#include <linux/seq_file.h>
	10	#include "internal.h"
	11
	12	/*
	13	* Logic: we've got two memory sums for each process, "shared", and
025dfdaf	14	* "non-shared". Shared memory may get counted more than once, for
1da177e4 LT	15	* each process that owns it. Non-shared memory is counted
	16	* accurately.
	17	*/
df5f8314	18	void task_mem(struct seq_file m, struct mm_struct mm)
1da177e4	19	{
8feae131	20	struct vm_area_struct *vma;
38f71479	21	struct vm_region *region;
8feae131	22	struct rb_node *p;
38f71479	23	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
1da177e4 LT	24
1da177e4 LT	25	down_read(&mm->mmap_sem);
8feae131 DH	26	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
8feae131 DH	27	vma = rb_entry(p, struct vm_area_struct, vm_rb);
1da177e4	28
8feae131	29	bytes += kobjsize(vma);
38f71479 DH	30
	31	region = vma->vm_region;
	32	if (region) {
	33	size = kobjsize(region);
	34	size += region->vm_end - region->vm_start;
	35	} else {
	36	size = vma->vm_end - vma->vm_start;
	37	}
	38
1da177e4	39	if (atomic_read(&mm->mm_count) > 1 \|\|
8feae131	40	vma->vm_flags & VM_MAYSHARE) {
38f71479	41	sbytes += size;
1da177e4	42	} else {
38f71479 DH	43	bytes += size;
	44	if (region)
	45	slack = region->vm_end - vma->vm_end;
1da177e4 LT	46	}
	47	}
	48
	49	if (atomic_read(&mm->mm_count) > 1)
	50	sbytes += kobjsize(mm);
	51	else
	52	bytes += kobjsize(mm);
	53
498052bb	54	if (current->fs && current->fs->users > 1)
1da177e4 LT	55	sbytes += kobjsize(current->fs);
	56	else
	57	bytes += kobjsize(current->fs);
	58
	59	if (current->files && atomic_read(&current->files->count) > 1)
	60	sbytes += kobjsize(current->files);
	61	else
	62	bytes += kobjsize(current->files);
	63
	64	if (current->sighand && atomic_read(&current->sighand->count) > 1)
	65	sbytes += kobjsize(current->sighand);
	66	else
	67	bytes += kobjsize(current->sighand);
	68
	69	bytes += kobjsize(current); /* includes kernel stack */
	70
df5f8314	71	seq_printf(m,
1da177e4 LT	72	"Mem:\t%8lu bytes\n"
	73	"Slack:\t%8lu bytes\n"
	74	"Shared:\t%8lu bytes\n",
	75	bytes, slack, sbytes);
	76
	77	up_read(&mm->mmap_sem);
1da177e4 LT	78	}
	79
	80	unsigned long task_vsize(struct mm_struct *mm)
	81	{
8feae131 DH	82	struct vm_area_struct *vma;
8feae131 DH	83	struct rb_node *p;
1da177e4 LT	84	unsigned long vsize = 0;
	85
	86	down_read(&mm->mmap_sem);
8feae131 DH	87	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
8feae131 DH	88	vma = rb_entry(p, struct vm_area_struct, vm_rb);
38f71479	89	vsize += vma->vm_end - vma->vm_start;
1da177e4 LT	90	}
	91	up_read(&mm->mmap_sem);
	92	return vsize;
	93	}
	94
a2ade7b6 AD	95	unsigned long task_statm(struct mm_struct *mm,
	96	unsigned long shared, unsigned long text,
	97	unsigned long data, unsigned long resident)
1da177e4	98	{
8feae131	99	struct vm_area_struct *vma;
38f71479	100	struct vm_region *region;
8feae131	101	struct rb_node *p;
a2ade7b6	102	unsigned long size = kobjsize(mm);
1da177e4 LT	103
1da177e4 LT	104	down_read(&mm->mmap_sem);
8feae131 DH	105	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
	106	vma = rb_entry(p, struct vm_area_struct, vm_rb);
	107	size += kobjsize(vma);
38f71479 DH	108	region = vma->vm_region;
	109	if (region) {
	110	size += kobjsize(region);
	111	size += region->vm_end - region->vm_start;
	112	}
1da177e4 LT	113	}
1da177e4 LT	114
7e1e0ef2 SM	115	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
	116	>> PAGE_SHIFT;
	117	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
	118	>> PAGE_SHIFT;
1da177e4	119	up_read(&mm->mmap_sem);
7e1e0ef2 SM	120	size >>= PAGE_SHIFT;
7e1e0ef2 SM	121	size += text + data;
1da177e4 LT	122	*resident = size;
	123	return size;
	124	}
	125
8feae131 DH	126	/*
	127	* display a single VMA to a sequenced file
	128	*/
b7643757 SP	129	static int nommu_vma_show(struct seq_file m, struct vm_area_struct vma,
b7643757 SP	130	int is_pid)
8feae131	131	{
3c26c9d9	132	struct mm_struct *mm = vma->vm_mm;
b7643757	133	struct proc_maps_private *priv = m->private;
8feae131 DH	134	unsigned long ino = 0;
	135	struct file *file;
	136	dev_t dev = 0;
652586df	137	int flags;
6260a4b0	138	unsigned long long pgoff = 0;
8feae131 DH	139
	140	flags = vma->vm_flags;
	141	file = vma->vm_file;
	142
	143	if (file) {
496ad9aa	144	struct inode *inode = file_inode(vma->vm_file);
8feae131 DH	145	dev = inode->i_sb->s_dev;
8feae131 DH	146	ino = inode->i_ino;
4c967291	147	pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
8feae131 DH	148	}
8feae131 DH	149
652586df	150	seq_setwidth(m, 25 + sizeof(void ) 6 - 1);
8feae131	151	seq_printf(m,
652586df	152	"%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
8feae131 DH	153	vma->vm_start,
	154	vma->vm_end,
	155	flags & VM_READ ? 'r' : '-',
	156	flags & VM_WRITE ? 'w' : '-',
	157	flags & VM_EXEC ? 'x' : '-',
	158	flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
6260a4b0	159	pgoff,
652586df	160	MAJOR(dev), MINOR(dev), ino);
8feae131 DH	161
8feae131 DH	162	if (file) {
652586df	163	seq_pad(m, ' ');
8feae131	164	seq_path(m, &file->f_path, "");
3c26c9d9	165	} else if (mm) {
b7643757 SP	166	pid_t tid = vm_is_stack(priv->task, vma, is_pid);
	167
	168	if (tid != 0) {
652586df	169	seq_pad(m, ' ');
b7643757 SP	170	/*
	171	* Thread stack in /proc/PID/task/TID/maps or
	172	* the main process stack.
	173	*/
	174	if (!is_pid \|\| (vma->vm_start <= mm->start_stack &&
	175	vma->vm_end >= mm->start_stack))
	176	seq_printf(m, "[stack]");
	177	else
	178	seq_printf(m, "[stack:%d]", tid);
3c26c9d9	179	}
8feae131 DH	180	}
	181
	182	seq_putc(m, '\n');
	183	return 0;
	184	}
	185
1da177e4	186	/*
dbf8685c	187	* display mapping lines for a particular process's /proc/pid/maps
1da177e4	188	*/
b7643757	189	static int show_map(struct seq_file m, void _p, int is_pid)
1da177e4	190	{
8feae131	191	struct rb_node *p = _p;
5096add8	192
b7643757 SP	193	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
	194	is_pid);
	195	}
	196
	197	static int show_pid_map(struct seq_file m, void _p)
	198	{
	199	return show_map(m, _p, 1);
	200	}
	201
	202	static int show_tid_map(struct seq_file m, void _p)
	203	{
	204	return show_map(m, _p, 0);
1da177e4	205	}
dbf8685c	206
1da177e4 LT	207	static void m_start(struct seq_file m, loff_t *pos)
1da177e4 LT	208	{
dbf8685c	209	struct proc_maps_private *priv = m->private;
dbf8685c	210	struct mm_struct *mm;
8feae131	211	struct rb_node *p;
dbf8685c DH	212	loff_t n = *pos;
	213
	214	/* pin the task and mm whilst we play with them */
	215	priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
	216	if (!priv->task)
ec6fd8a4	217	return ERR_PTR(-ESRCH);
dbf8685c	218
27692cd5 ON	219	mm = priv->mm;
27692cd5 ON	220	if (!mm \|\| !atomic_inc_not_zero(&mm->mm_users)) {
dbf8685c DH	221	put_task_struct(priv->task);
dbf8685c DH	222	priv->task = NULL;
27692cd5	223	return NULL;
dbf8685c	224	}
00f89d21	225	down_read(&mm->mmap_sem);
dbf8685c	226
dbf8685c	227	/* start from the Nth VMA */
8feae131	228	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
dbf8685c	229	if (n-- == 0)
8feae131	230	return p;
1da177e4 LT	231	return NULL;
1da177e4 LT	232	}
dbf8685c DH	233
dbf8685c DH	234	static void m_stop(struct seq_file m, void _vml)
1da177e4	235	{
dbf8685c DH	236	struct proc_maps_private *priv = m->private;
	237
	238	if (priv->task) {
	239	struct mm_struct *mm = priv->task->mm;
	240	up_read(&mm->mmap_sem);
	241	mmput(mm);
	242	put_task_struct(priv->task);
	243	}
1da177e4	244	}
dbf8685c	245
8feae131	246	static void m_next(struct seq_file m, void _p, loff_t pos)
1da177e4	247	{
8feae131	248	struct rb_node *p = _p;
dbf8685c DH	249
dbf8685c DH	250	(*pos)++;
8feae131	251	return p ? rb_next(p) : NULL;
1da177e4	252	}
dbf8685c	253
03a44825	254	static const struct seq_operations proc_pid_maps_ops = {
1da177e4 LT	255	.start = m_start,
	256	.next = m_next,
	257	.stop = m_stop,
b7643757 SP	258	.show = show_pid_map
	259	};
	260
	261	static const struct seq_operations proc_tid_maps_ops = {
	262	.start = m_start,
	263	.next = m_next,
	264	.stop = m_stop,
	265	.show = show_tid_map
1da177e4	266	};
662795de	267
b7643757 SP	268	static int maps_open(struct inode inode, struct file file,
b7643757 SP	269	const struct seq_operations *ops)
662795de	270	{
dbf8685c	271	struct proc_maps_private *priv;
ce34fddb	272
27692cd5	273	priv = __seq_open_private(file, ops, sizeof(*priv));
ce34fddb ON	274	if (!priv)
	275	return -ENOMEM;
	276
	277	priv->pid = proc_pid(inode);
27692cd5 ON	278	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
	279	if (IS_ERR(priv->mm)) {
	280	int err = PTR_ERR(priv->mm);
	281
	282	seq_release_private(inode, file);
	283	return err;
	284	}
	285
ce34fddb	286	return 0;
662795de EB	287	}
662795de EB	288
27692cd5 ON	289
	290	static int map_release(struct inode inode, struct file file)
	291	{
	292	struct seq_file *seq = file->private_data;
	293	struct proc_maps_private *priv = seq->private;
	294
	295	if (priv->mm)
	296	mmdrop(priv->mm);
	297
	298	return seq_release_private(inode, file);
	299	}
	300
b7643757 SP	301	static int pid_maps_open(struct inode inode, struct file file)
	302	{
	303	return maps_open(inode, file, &proc_pid_maps_ops);
	304	}
	305
	306	static int tid_maps_open(struct inode inode, struct file file)
	307	{
	308	return maps_open(inode, file, &proc_tid_maps_ops);
	309	}
	310
	311	const struct file_operations proc_pid_maps_operations = {
	312	.open = pid_maps_open,
	313	.read = seq_read,
	314	.llseek = seq_lseek,
27692cd5	315	.release = map_release,
b7643757 SP	316	};
	317
	318	const struct file_operations proc_tid_maps_operations = {
	319	.open = tid_maps_open,
662795de EB	320	.read = seq_read,
662795de EB	321	.llseek = seq_lseek,
27692cd5	322	.release = map_release,
662795de EB	323	};
662795de EB	324